Ok, I have gone to the books to better discribe the parts. The part that was working it's way off was the half-circle shaped "clip" with the square hole in it. It sits on top of the flange of the inner valve cover sleeve pressing it against the cork gasket that is held in the retainer on the bottom. The clip is bent, it does not fit inside the lip of the retainer cup so it is not transmitting the proper pressure to the flange to seal against the gasket. I have been working on it for the last few days and I've gotten it to seal better.